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add axplanations for bbframe mode

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This commit is contained in:
Ralph Metzler 2018-03-22 19:33:35 +01:00
parent 3db30defab
commit 9acbf467ec
1 changed files with 24 additions and 2 deletions
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docs/bbframes
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@ -1,15 +1,16 @@
To allow the transport of DVB-S2 baseband frames (BBFrame) across existing hard- and software To allow the transport of DVB-S2 baseband frames (BBFrame) across existing hard- and software
interfaces, we have added the ability to embed the BBFrame data into interfaces, we have added the ability to embed the BBFrame data into
an MPEG2 transport stream. an MPEG2 transport stream.
This is available on supported cards as firmware update.
This feature is currently considered experimental. This feature is available on supported cards as firmware update and
is currently considered experimental.
Supported hardware: Supported hardware:
Cine V7A (>=1.7 FW) Cine V7A (>=1.7 FW)
OctopusCI S2 Pro Advanced (>=1.7 FW) OctopusCI S2 Pro Advanced (>=1.7 FW)
Duoflex S2 v4 Advanced (TBA) Duoflex S2 v4 Advanced (TBA)
MaxSX8 (NOT the MAXS8!)
The following cards are based on the broadcast version of the The following cards are based on the broadcast version of the
DVB-S2 demodulator. The BBFrame output is working but DVB-S2 demodulator. The BBFrame output is working but
@ -80,3 +81,24 @@ API:
Currently DTV_STREAM_ID is misused. Currently DTV_STREAM_ID is misused.
Set it to 0x80000000 to enable frame mode in the demod. Set it to 0x80000000 to enable frame mode in the demod.
Because there were some questions why we use this data format,
here are some examples for why using this format this makes handling BBFrames easier:
- The start of a frame is easily found because a new set of sections is
started.
- Existing software layers like the Linux kernel DVB demuxer can be used unchanged.
- Existing hardware like the OctopusNet SAT>IP server which can only handle TS packets can
stream BBFrames via SAT>IP with this method.
- There is at least one demodulator (e.g. on the MaxSX8) which supports this format in hardware.